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• Water Ouality <br />The water quality data are summarized in Tables 2~ through 29 for the spoil wells. The historic <br />dissolved solids concentrations for the wells are plotted on Figure 20. The field conductivity <br />ranged from 2800 to 3910 mg/l in 1992. Tl~e dissolved solids concentrations in all wells show <br />temporal fluctuations that most likely retlect recharge events of ]ow TDS snowmelt. The lowest <br />TDS concentrations in the spoil groundwater typically occur during the Spring snowmelt period. <br />Dissolved solids appear to show an increasing trend over time in well 026-SP-1 and alevelling- <br />off of average dissolved solids values in wells 026-SP-2 and 026-SP-3. The spoil groundwater <br />has comparable dissolved solids concentrations to most of the spoil spring discharges but much <br />higher values than in the background bedrock groundwater. The spoil groundwater is a calcium- <br />sulfate type with relatively high bicarbonate and low SAR. The data does not indicate any <br />significant changes in the trace metals concentrations. Well 026-SP-2 has relatively high <br />manganese concentrations. <br />• <br />r~ <br />LJ <br />-6- <br />